Code:
/ FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / Security / HostSecurityManager.cs / 2 / HostSecurityManager.cs
// ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== // // A HostSecurityManager gives a hosting application the chance to // participate in the security decisions in the AppDomain. // namespace System.Security { using System.Collections; using System.Deployment.Internal.Isolation; using System.Deployment.Internal.Isolation.Manifest; using System.Reflection; using System.Security; using System.Security.Permissions; using System.Security.Policy; using System.Runtime.Hosting; [Flags, Serializable()] [System.Runtime.InteropServices.ComVisible(true)] public enum HostSecurityManagerOptions { None = 0x0000, HostAppDomainEvidence = 0x0001, HostPolicyLevel = 0x0002, HostAssemblyEvidence = 0x0004, HostDetermineApplicationTrust = 0x0008, HostResolvePolicy = 0x0010, AllFlags = 0x001F } [Serializable] [SecurityPermissionAttribute(SecurityAction.LinkDemand, Flags=SecurityPermissionFlag.Infrastructure)] [SecurityPermissionAttribute(SecurityAction.InheritanceDemand, Flags=SecurityPermissionFlag.Infrastructure)] [System.Runtime.InteropServices.ComVisible(true)] public class HostSecurityManager { public HostSecurityManager () {} // The host can choose which events he wants to participate in. This property can be set when // the host only cares about a subset of the capabilities exposed through the HostSecurityManager. public virtual HostSecurityManagerOptions Flags { get { // We use AllFlags as the default. return HostSecurityManagerOptions.AllFlags; } } // provide policy for the AppDomain. public virtual PolicyLevel DomainPolicy { get { return null; } } public virtual Evidence ProvideAppDomainEvidence (Evidence inputEvidence) { // The default implementation does not modify the input evidence. return inputEvidence; } public virtual Evidence ProvideAssemblyEvidence (Assembly loadedAssembly, Evidence inputEvidence) { // The default implementation does not modify the input evidence. return inputEvidence; } #if !FEATURE_PAL [SecurityPermissionAttribute(SecurityAction.Assert, Unrestricted=true)] public virtual ApplicationTrust DetermineApplicationTrust (Evidence applicationEvidence, Evidence activatorEvidence, TrustManagerContext context) { if (applicationEvidence == null) throw new ArgumentNullException("applicationEvidence"); // This method looks for a trust decision for the ActivationContext in three locations, in order // of preference: // // 1. Supplied by the host in the AppDomainSetup. If the host supplied a decision this way, it // will be in the applicationEvidence. // 2. Reuse the ApplicationTrust from the current AppDomain // 3. Ask the TrustManager for a trust decision // get the activation context from the application evidence. // The default HostSecurityManager does not examine the activatorEvidence // but other security managers could use it to figure out the // evidence of the domain attempting to activate the application. IEnumerator enumerator = applicationEvidence.GetHostEnumerator(); ActivationArguments activationArgs = null; ApplicationTrust appTrust = null; while (enumerator.MoveNext()) { if (activationArgs == null) activationArgs = enumerator.Current as ActivationArguments; if (appTrust == null) appTrust = enumerator.Current as ApplicationTrust; if (activationArgs != null && appTrust != null) break; } if (activationArgs == null) throw new ArgumentException(Environment.GetResourceString("Policy_MissingActivationContextInAppEvidence")); ActivationContext actCtx = activationArgs.ActivationContext; if (actCtx == null) throw new ArgumentException(Environment.GetResourceString("Policy_MissingActivationContextInAppEvidence")); // Make sure that any ApplicationTrust we find applies to the ActivationContext we're // creating the new AppDomain for. if (appTrust != null && !CmsUtils.CompareIdentities(appTrust.ApplicationIdentity, activationArgs.ApplicationIdentity, ApplicationVersionMatch.MatchExactVersion)) { appTrust = null; } // If there was not a trust decision supplied in the Evidence, we can reuse the existing trust // decision from this domain if its identity matches the ActivationContext of the new domain. // Otherwise consult the TrustManager for a trust decision if (appTrust == null) { if (AppDomain.CurrentDomain.ApplicationTrust != null && CmsUtils.CompareIdentities(AppDomain.CurrentDomain.ApplicationTrust.ApplicationIdentity, activationArgs.ApplicationIdentity, ApplicationVersionMatch.MatchExactVersion)) { appTrust = AppDomain.CurrentDomain.ApplicationTrust; } else { appTrust = ApplicationSecurityManager.DetermineApplicationTrustInternal(actCtx, context); } } // If the trust decision allows the application to run, then it should also have a permission set // which is at least the permission set the application requested. ApplicationSecurityInfo appRequest = new ApplicationSecurityInfo(actCtx); if (appTrust != null && appTrust.IsApplicationTrustedToRun && !appRequest.DefaultRequestSet.IsSubsetOf(appTrust.DefaultGrantSet.PermissionSet)) { throw new InvalidOperationException(Environment.GetResourceString("Policy_AppTrustMustGrantAppRequest")); } return appTrust; } #endif //!FEATURE_PAL public virtual PermissionSet ResolvePolicy (Evidence evidence) { return SecurityManager.PolicyManager.ResolveHelper(evidence); } } }
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